The Mystery of Magnets
Building Background Magnets
Vocabulary Let’s Explore Magnets & Exploring Magnetism
What do you already know about ‘magnets’? What do you want to
know about ‘magnets’? Complete the KWL chart below.
Write the correct word from the Word Bank next to the definition.
[ Word Bank ]
What I Know
What I Want to Know
experiment
nature
What I Learned
compass
machine
record
uncover
1. everything in the physical world that is not controlled by humans
2. a tool with a magnetic needle that points north to determine
direction
3. a scientific test done to find out how something reacts under
certain conditions
nature
compass
experiment
record
4. to write information down
5. to find out about something that has been kept secretly
6. a piece of equipment that uses power such as electricity to do a
particular job
uncover
machine
Write about your chart above.
I know that magnets are _________________________________________
Circle the antonym of the underlined word.
____________________________________________________________________
____________________________________________________________________
What I want to know about magnets are ___________________________________
____________________________________________________________________
____________________________________________________________________
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Four Corners Workbook
1. A magnet can also repel other magnets away from it.
① attract
② push
③ take
④ hold
2. Magnets also come in different strengths.
① power
② machine
③ equipment
④ weakness
The Mystery of Magnets
3
Comprehension Let’s Explore Magnets & Exploring Magnetism (1)
Read the sentences and answer the questions.
Read the paragraph and circle the correct answer.
A ____________ is an object that has the natural power to attract certain
other objects towards it. ____________ can also repel other magnets away
from it. This is called magnetism.
1. What is a common word to go in the blanks?
① stone
② radio
③ magnet
④ machine
2. What is ‘magnetism’?
①
②
③
④
magnet’s power to attract and repel certain objects
the power to pull down certain objects to the center of the Earth
a power to attract certain objects
a power to repel certain objects away
3. What are the magnets that can be found in nature?
① rock
② lodestone
③ trains
④ track
Write the correct answer from the Word Bank.
eraser
rubber band
crayon
key
1. Which objects do magnets attract?
scissors, key
2. Which objects don’t magnets attract?
plastic pen cap, eraser, crayon, rubber band
3. Write about how the objects that magnets attract are alike in your own words.
They are metal objects.
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Four Corners Workbook
Make a Magnetic Boat
1. Draw a small boat shape on the cork. Cut out the boat shape.
2. Carefully push the drawing pin into the center of the cork boat.
3. Cut out one triangular paper sail. Tape the pin to the base of the sail.
4. Turn the cork boat over so that the drawing pin
points up.
5. Tape the bar magnet to one end of the
ruler.
6. Set two books slightly apart on a table.
Place the dish on the books. Half-fill
the dish with water.
7. Float the boat in the dish. Touch the
base of the bowl with the magnet at the
end of the ruler. Slowly move the ruler around.
1. What will happen if you move the ruler?
[ Word Bank ]
plastic pen cap
scissors
Comprehension Let’s Explore Magnets & Exploring Magnetism (2)
① The boat will sink in the water.
③ The boat won’t move.
② The boat will move.
④ The boat will be broken down.
2. What makes the boat move?
① magnetism
③ gravity
② lodestone
④ cork
3. Write the materials for the experiment from the box.
a sheet of cork
a coin
a shallow glass dish
a drawing pin
a bar magnet
a key
a sheet of cork, a shallow glass dish, a drawing pin, a bar magnet
The Mystery of Magnets
5
Vocabulary Exploring Poles & Exploring New Magnets
Complete the word puzzle.
❶
❺
Read the paragraph and circle the correct answer.
❿
❾
o l e s
o b s e r v e
t
a
o
r u l e r
i
o
i
n
n e e d l e
t i p
p
g
i
o
f
s
t
s i m i l a r
t
p
❻
❸
❼
❷
Comprehension Exploring Poles (1)
Every magnet has two areas where the attraction is strongest. These
areas are called poles. All magnets have a north pole and a south pole. The
north pole of a magnet is attracted towards Earth’s North Pole. On a bar
magnet, the poles are at opposite ends. You can use a ____________ to
find the north and south poles on a bar magnet.
❽
❹
1. What is the paragraph about?
① poles of magnets
③ compass
2. On a bar magnet, where might the south pole of a magnet be attracted?
① toward the air
③ toward Earth’s South Pole
① telescope
Across
Down
1. the parts of a magnet where the
1. to show something by holding up one of
2. the end of something, especially
something pointed
4. almost the same
6. a long flat straight objects that is used
for measuring things or drawing straight
lines
7. a long thin piece of metal on a scientific
instrument; pointer
10. to see and notice something
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Four Corners Workbook
② toward the center of the Earth
④ toward Earth’s North Pole
3. What word goes in the blank?
e
magnetic force is the strongest
② South pole
④ North pole
② compass
③ needle
④ ruler
Circle the correct answer.
fingers or a thin object towards it
3. facing each other
5. a strong thread made of several threads
twisted together
8. to move something or someone upwards
into the air
9. a small block of solid material that is
longer than it is wide
1. Which is true about poles of magnets?
① Poles sometimes attract each other. ② Poles never attract each other.
③ Poles always attract each other.
④ Poles always repel each other.
2. How does compass help travelers or hikers find their way?
①
②
③
④
Its tip always points the center of the Earth.
Its tip always points west.
Its tip always points north.
Its tip always points east.
The Mystery of Magnets
7
Comprehension Exploring Poles (2)
Read the steps of two experiments and answer the questions.
Comprehension Exploring New Magnets
Read the steps of an experiment and answer the questions.
1. Place your nail or pin near a paper clip.
2. Rub the magnet along the nail or pin. Repeat about 60 times.
3. Try picking up the paper clips with the nail or pin.
(A) 1. Place the magnets on a table with
the south pole of one facing the
north pole of the other.
2. Slide the magnets towards each
other.
1. What are the steps for?
(B) 1. Place the magnets on a table with
①
②
③
④
the two south poles facing each
other.
2. Try to push them together.
researching when magnets repel
making a magnet boat
making a magnet
testing magnet’s strength
2. What will happen in step 3?
1. Write what happens in experiment (A).
Two poles attract each other.
①
②
③
④
The nail or pin can’t pick up the paper clips.
The nail or pin repels the paper clips.
The nail or pin points the center of the Earth.
The nail or pin picks up the paper clips.
2. Write what that happens in experiment (B).
Two poles repel each other.
3. What can you know from the experiments?
①
②
③
④
The same poles always repel each other.
The same poles always attract each other.
The different poles always repel each other.
The different poles don’t attract each other.
4. What is the best title for the experiments?
① North or South Pole?
③ What Are Magnets?
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Four Corners Workbook
② When Do Magnets Repel?
④ Make a Magnetic Boat
3. Which is the important caution in step 2?
①
②
③
④
Repeat rubbing magnets more than three times.
Rub the magnet in one direction only.
Repeat rubbing magnets only once.
Rub the magnet in many directions.
4. Write the materials for the experiment from the box.
a nail
an eraser
a bar magnet
metal paper clips
a sheet of cork
a rubber band
a nail, a bar magnet, metal paper clips
The Mystery of Magnets
9
Vocabulary
Magnet Fun
Comprehension Magnet Fun (1)
Fill in the blanks with the correct words to match the pictures from
the Word Bank. If needed, capitalize the first letter.
Look at the picture and circle the correct answer.
[ Word Bank ]
cover
tape
circles
small box
Magnetic Car
decorate
ask
A magnet is taped inside.
1. Tape one of the magnets to the inside of the
small box
_______________.
2. Cut two lengths of straw the same width as the box.
Tape
_______________ the straws on the outside of the box as
shown.
draw
3. Use the compass to _______________ four circles on the
cardboard. Cut out the circles.
4. Cut the toothpicks or skewers a bit wider than the box.
Ask
_______________ an adult to help you push them through
1. How can you move the car forward using another magnet?
①
②
③
④
Hold the same pole of magnet close to the car.
Hold the different pole of magnet close to the car.
Break the magnet into two pieces.
Attach the magnet to the roof of the car.
2. If your magnet attracts the car, how can you move the car forward?
①
②
③
④
Break the magnet into two pieces.
Put the magnet on the floor.
Flip the magnet end to end so it repels.
Rub the magnet along the car many times.
the straws and the centers of the wheels.
3. What nature of magnet makes the car move?
Cover
5. _______________ the ends with modeling clay to hold the
wheels in place. Check that the toothpick or skewer spins
freely inside the straw.
6. Cut out a top for your car from construction paper. Attach it to the box with glue or tape.
Decorate
_______________ your completed car with markers, stickers or colorful paper cut-outs.
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Four Corners Workbook
①
②
③
④
The different poles of magnets always repel each other.
The same poles of magnets always repel each other.
The different poles of magnets always attract each other.
The same poles of magnets always attract each other.
4. What is the power of magnet that attracts or repels each other?
① lodestone
③ magnetism
② super natural power
④ repel
The Mystery of Magnets
11
Comprehension Magnet Fun (2)
Final Test (1)
Write the number of each direction from the box to match the picture.
1.
(6)
2.
(2)
3.
(4)
1. Read the sentences. Find and write two opposite words.
A magnet is an object that has the natural power to attract certain other objects
towards it. A magnet can also repel other magnets away from it.
attract and repel
2. Which is true about ‘lodestone’?
4.
(3)
5.
(5)
6.
(7)
①
②
③
④
It can be found in nature.
It makes distant objects look larger and closer.
Its needle always points north.
It has two poles at opposite ends.
3. Write the objects that attach to magnets.
7.
(1)
a rubber band
an eraser
scissors
paper clips
nails
glue
scissors, paper clips, nails
4. How are the objects that attach to magnets alike?
(1) Place all the sea catches in the box.
(2) Write a number between one and ten on one side of each fish or creature.
(3) Slide one paper clip onto each cut-out.
(4) Cut out five small ‘unwanted catches’, like old boots or clumps of seaweed.
(5) Cut one 20-centimeter piece of string. Tie one end of the string to the ruler
and the other end to the magnet.
(6) Cut out ten to fifteen small fish and sea creature shapes from the
construction paper.
(7) Use markers, stickers or colorful paper cut-outs to decorate the outside of
the cardboard box like an underwater scene.
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Four Corners Workbook
① They are made with plastics.
③ They are made with rubber.
② They are made with iron or steel.
④ They are made with oil.
5. What are two areas of magnet where the attraction is the strongest?
① North Pole
③ telescope
② gravity
④ poles
6. Write why a compass should not be held near a magnet when it is being read.
Because the magnet can affect reading a compass.
The Mystery of Magnets
13
Grammar Imperatives (1)
Final Test (2)
1. Imagine that two magnets are placed on a table as facing two poles with the
combinations in the chart. Mark( ) on the correct results in the chart.
Change the sentences into positive imperatives.
Example
Magnetic Combination
Repel?
Attract?
north-south
You must close the door now. → Close the door now.
1. You must drink a lot of water while exercising.
→
Drink a lot of water while exercising.
south-north
north-north
south-south
2. You must take an umbrella with you when it is cloudy.
→
Take an umbrella with you when it is cloudy.
3. Let’s clean the house before the visitors arrive.
→
2. Write about the nature of magnet from the chart above in your own words.
The same poles of magnets always repel each other.
And the different poles of magnets always attract
each other.
3. How can you change a steel object into a magnet?
①
②
③
④
breaking the object into pieces
rubbing magnet along the object many times
heating the object for a long time
freezing the object for a long time
Clean the house before the visitors arrive.
4. Let’s make a cake to celebrate a New Year.
→
Make a cake to celebrate a New year.
Change the sentences into negative imperatives.
Example
Sit on this chair. → Don’t sit on this chair.
1. Stand near the window.
→
Don’t stand near the window.
2. Go to Pete’s house on Sunday.
4. Reread Book page 13 and write about a compass and how it helps to find a way.
The needle in a compass is a magnet. And its tip
points north. So travellers, hikers, pilots or sailors
use it to find their way.
→
3. Decorate your box before the water color is dried.
→
Four Corners Workbook
Don’t decorate your box before the
water color is dried.
4. Drink my lemonade on the table.
→
14
Don’t go to Pete’s house on Sunday.
Don’t drink my lemonade on the table.
The Mystery of Magnets
15
Grammar Imperatives (2)
Writing Magnet Fun
Circle the correct verbs to complete imperative sentences.
Do you have any ideas about having fun with magnets? Write about
the steps for a magnetic game using imperative sentences. If
needed, draw pictures.
1. (Cut Lift) the magnet by the string. Tape the string to the edge of a table or desk so
that it hangs in midair.
Materials:
2. (Cut Choose) another player for the timekeeper.
3. (Move Use) your compass to find north. Place a pencil or ruler on the table pointing
north.
4. Move the magnet slightly. (Wait Use) until the magnet is still. Observe which end of the
magnet points north.
Steps:
1.
Fill in the blanks with the correct verb to complete each sentence. If
necessary, capitalize the first letter.
2.
[ Word Bank ]
make
look
rub
float
3.
1.
Rub
the magnet along the nail or pin. Repeat about 60 times.
2. Once the magnet is still,
look
at the direction it is facing. Which end of the bar
4.
magnet points north?
3.
Float
the boat in the dish. Touch the base of the bowl with the magnet at the end of
the ruler.
4. On a sheet of paper,
16
Four Corners Workbook
make
5.
a chart and record the objects that the magnet attracts.
The Mystery of Magnets
17
Listening Practice
MEMO
Listen to the sentence and fill in the blanks.
repel other magnets away from it.
1. A magnet can also __________
objects some objects and not others.
2. Magnets __________
needle in a compass is a magnet.
3. The __________
attraction is __________.
strongest
4. Every magnet has two areas where the __________
turns at
clockwise until each player has had three __________
5. Go around the circle __________
fishing.
Listen to the paragraph and fill in the blanks.
machines make many kinds of magnets.
6. Magnets are everywhere. People and __________
dryers
These can be seen at work in such things as televisions, hair __________,
high
speed trains and radios. Other magnets, such as lodestone, can be
__________-__________
nature
found in __________.
attach
horseshoe magnet over each object. Observe which objects __________
7. Lower the __________
Sort the objects into two piles.
themselves to the magnet and which do not. __________
north pole and a south __________.
pole The north pole of a
8. All magnets have a __________
attracted towards __________
Earth’s North Pole. On a __________
bar magnet,
magnet is __________
ends You can use a __________
compass to find the north and
the poles are at opposite __________.
south poles on a bar magnet.
still
9. Once the magnet is __________,
look at the direction it is facing. Which end of the bar
north Paint the end that points south __________.
blue Move the
magnet points __________?
stay
magnet __________.
Wait until the magnet is still. Observe which end of the magnet
slightly north. Repeat this step several times.
__________
catches like old boots or clumps of __________.
seaweed
10. Cut out five small ‘unwanted __________’,
Miss a turn!’ or ‘Got __________!’
away
Write messages, such as ‘__________
on one side of
each shape.
18
Four Corners Workbook
The Mystery of Magnets
19
Four Corners
WORKBOOK
The Mystery of Magnets
Publisher Jae-yoon Chung
Managing Director Hannah Lee
Senior Editor Jung-ah Kim
Project Editor Reese Ji
Written by Jeong Hee Choi
Proofread by Alwin G. Fontenot
Recorded by Yeasung Media Tech
Illustrated by Donghyun Lee, Youngjoo Jung
Designed by DOD Design
Printed by POD KOREA
Copyright © 2008 by Language World Co., Ltd.
All rights reserved. No part of this publication may be reproduced or distributed in any form
or by any means, or stored in a database or retrieval system,
without the prior written consent of Language World Co., Ltd., including, but not limited to,
in any network or other electronic storage or transmission, or broadcast for distance learning.
www.lwbooks.co.kr
First Edition in 2008
ISBN 978-89-256-0033-8